1. Going to an amusement park can come at a cost to the environment.
2. Environmental workers in many non-profit organizations educate the public about sustainability.
3. Jack Johnson challenges his fans to reduce, reuse, and recycle.
4. We need to take action and change our behavior for the future of our planet.
5. We can compost skins of fruit and vegetables instead of throwing them into the rubbish.
6. I think the last one's demand. I'm not sure because none of them sound right to me in that sentence. You might have to do a bit more research.
I hope this helped!